digicademy/svsal: SvSal v1.2.1

This is a minor release with some additions and revisions, and a few small fixes.

Additions and revisions:

• Small additions of descriptive content on the website, e.g. with regards to legal information.
• Smaller additions within the SalTEI schema.
• Revision and extension of the list of special characters, especially regarding small letters with macron.
• Updated the SvSal oXygen framework.
• Added a new styling for marginal notes in the reading view, making them more neatly arranged and expansible on the spot.
• Added more specific rules for transforming TEI elements to HTML.

Bugfixes:

• Fixed the differentiation between bibliographic metadata for the edition at hand and the first edition (if available) in works overview.
• Smaller fixes with Mirador.